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孕镶钻头胎体对金刚石机械把持力的评价方法

赵小军 段隆臣 谭松成 方小红

赵小军, 段隆臣, 谭松成, 方小红. 孕镶钻头胎体对金刚石机械把持力的评价方法[J]. 金刚石与磨料磨具工程, 2022, 42(6): 656-661. doi: 10.13394/j.cnki.jgszz.2022.3005
引用本文: 赵小军, 段隆臣, 谭松成, 方小红. 孕镶钻头胎体对金刚石机械把持力的评价方法[J]. 金刚石与磨料磨具工程, 2022, 42(6): 656-661. doi: 10.13394/j.cnki.jgszz.2022.3005
ZHAO Xiaojun, DUAN Longchen, TAN Songcheng, FANG Xiaohong. Evaluation method for the mechanical diamond retention of impregnated bit matrix[J]. Diamond & Abrasives Engineering, 2022, 42(6): 656-661. doi: 10.13394/j.cnki.jgszz.2022.3005
Citation: ZHAO Xiaojun, DUAN Longchen, TAN Songcheng, FANG Xiaohong. Evaluation method for the mechanical diamond retention of impregnated bit matrix[J]. Diamond & Abrasives Engineering, 2022, 42(6): 656-661. doi: 10.13394/j.cnki.jgszz.2022.3005

孕镶钻头胎体对金刚石机械把持力的评价方法

doi: 10.13394/j.cnki.jgszz.2022.3005
基金项目: 国家自然科学基金面上项目(41672364)。
详细信息
    作者简介:

    赵小军,男,1992年生,博士。研究方向:金刚石钻头、金刚石复合片。Email: zhaoxiaojun1218@foxmail.com

    通讯作者:

    段隆臣,男,1967年生,教授。研究方向:岩石破碎与金刚石工具。Email:duanlongchen@163.com

  • 中图分类号: TQ164;TB333

Evaluation method for the mechanical diamond retention of impregnated bit matrix

  • 摘要: 传统的孕镶钻头胎体对金刚石的把持力来源于机械把持力。金刚石表面的残余压应力是评价胎体对金刚石机械把持力的重要指标。本文中,对现有的金刚石表面压应力计算方法进行比较和评价,发现经验公式、弹性力学方程表征公式的计算结果与实际值差别很大,公式形式不够合理,而基于弹塑性力学理论的力学计算公式与有限元数值模拟方法具有很好的有效性。对WC基金刚石复合材料烧结后的冷却过程分析发现,钻头胎体在烧结后的冷却过程中发生了塑性变形,金刚石颗粒周围形成塑性变形区域;塑性变形吸收了一部分能量,缓解了金刚石—胎体之间的热错配应力,释放了一部分金刚石表面的静压应力;冷却完成后,金刚石表面会产生残余压应力,而这种残余压应力是胎体对金刚石机械把持力的主要来源。

     

  • 图  1  孕镶金刚石钻头中金刚石的受力

    Figure  1.  Forces on diamond in impregnated bit

    图  2  金刚石—胎体弹塑性计算模型

    Figure  2.  Model of matrix-embedded particle

    图  3  WC基胎体烧结试样抗拉试验应力应变图

    Figure  3.  Stress and strain diagram of WC matrix sintered specimen in tensile test

    图  4  胎体的热膨胀系数(25~960℃)

    Figure  4.  Thermal expansion coefficient of matrix (25~960℃)

    图  5  金刚石的热膨胀系数(20~1 027℃)

    Figure  5.  Thermal expansion coefficient of diamond (20~1 027℃)

    图  6  弹性和弹塑性胎体材料模型下的压力云图

    Figure  6.  Pressure clouds under elastic and elasto-plastic matrix material models

    图  7  弹性和弹塑性胎体材料模型下的Mises云图

    Figure  7.  Mises stress clouds under elastic and elasto-plastic matrix material models

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出版历程
  • 收稿日期:  2022-07-03
  • 修回日期:  2022-08-19
  • 录用日期:  2022-08-20
  • 刊出日期:  2023-01-12

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